package com.ec.edu.common.config;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;

/**
 * @Author: jxyang
 * @Date: 2018/11/5 16:15
 * @Description:
 */
public class ApplicationContextProvider
{
    /**
     * 上下文对象实例
     */
    private static ApplicationContext applicationContext;
    static final private Object lock = new Object();

    public static void setApplicationContext(ApplicationContext applicationContext) throws BeansException
    {
        synchronized (lock)
        {
            if (null == ApplicationContextProvider.applicationContext)
            {
                ApplicationContextProvider.applicationContext = applicationContext;
            }
        }
    }

    /**
     * 获取applicationContext
     * @return
     */
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    /**
     * 通过name获取 Bean.
     * @param name
     * @return
     */
    public static Object getBean(String name){
        return getApplicationContext().getBean(name);
    }

    /**
     * 通过class获取Bean.
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T getBean(Class<T> clazz){
        return getApplicationContext().getBean(clazz);
    }

    /**
     * 通过name,以及Clazz返回指定的Bean
     * @param name
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T getBean(String name,Class<T> clazz){
        return getApplicationContext().getBean(name, clazz);
    }
}
